From the Department of Neurology, Kyung Hee University Medical Center, Seoul, Korea (B.J.K., S.H.H.). Department of Neurology (S.U.K., D.-W.K.), Asan Medical Center, Ulsan University, Seoul, Korea. Department of Neurology, Hanyang University, Myongji Hospital, Seoul, Korea (J.-H.P.). Department of Neurology, Eunpyeong St. Mary's Hospital, The Catholic University of Korea, Seoul (Y.-J.K.). Department of Neurology, Ilsan Paik Hospital, Inje University, Goyang, Korea (K.-S.H.). Department of Medicine and Therapeutics, Chinese University of Hong Kong (L.K.S.W.). Department of Neurology, Anam Hospital (S.Y.), Korea University, Seoul. Department of Neurology, Kyungpook National University Hospital, Daegu, Korea (Y.-H.H.). Clinical Research Center (J.S.L.), Asan Medical Center, Ulsan University, Seoul, Korea. Department of Biostatistics (J.L.), Korea University, Seoul. Department of Neurology, Inha University Hospital, Incheon, Korea (J.-H.R.). Department of Neurology, Chosun University Hospital, Gwangju, Korea (S.H.A.). Department of Neurology, Samsung Medical Center, Sungkyunkwan University, Seoul, Korea (W.-K.S.). Department of Neurology, Eulji General Hospital, Eulji University, Seoul, Korea (J.-M.P.). Department of Neurology, Sacred Heart Hospital, Hallym University, Seoul, Korea (J.-H.L.). Department of Neurology, Ulsan University Hospital, Ulsan University, Korea (J.-H.K.). Department of Neurology, Dongsan Medical Center, Keimyung University, Daegu, Korea (S.-I.S.). Department of Neurology, Ansan Hospital (J.-M.J.), Korea University, Seoul. Department of Neurology and Psychiatry, University of Santo Tomas Hospital, Manila, Philippines (J.C.N.). Department of Neurology, Konkuk University School of Medicine, Seoul, Korea (H.Y.K.). Department of Neurology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea (E.-G.K.). Department of Neurology, Kangwon National University Hospital, Chuncheon, Korea (S.K.). Department of Neurology, Dong-A University Hospital, Busan, Korea (J.-K.C.). Department of Neurology, Chonnam National University Medical School, Gwangju, Korea (M.-S.P.). Department of Neurology, Yonsei University Severance Hospital, Seoul, Korea (H.S.N.).